Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/3795#issuecomment-75147555
As discussed offline, we will extend the existing checks against using
Arrays as keys to using Enums as well, instead of trying to manually fix this
specific case. Otherwise we may give the user a false sense of hope if they
later try to use, say, tuples of Enums as keys, which won't work for the same
reason.
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